Figures (a) and (b) show the cross sections of two beams that are constructed by nailing together four 2-in.-thick wooden boards. Note that the cross sections have identical cross-sectional dimensions. For each beam, determine the largest allowable spacing of the nails that will resist an 8000-lb vertical shear force. The allowable shear force in each nail is 250 lb. 6 in. x 2 in.- 10 in. x 2 in. 0-0 8 in. x 2 in.- -12 in. x 2 in. (a) FIG. P5.92 (b)